I’m going to rate the V9 a 2 then, as its efficiency is very low. Probably a bunch of old tech which Bitmain is trying to offload. The price is cheap, it must be said, but if you pay for electricity this machine will never earn you any money (unless Bitcoin price goes to the moon).

The only way I could recommend this device is if you don’t pay for your power or have extremely cheap electricity. Then it’s a nice low price for the hashrate. Otherwise, it’s pretty terrible.